A kind of quenching and tempering method of 12cr13 stainless steel bar
A stainless steel rod, quenching and tempering technology, applied in furnaces, heat treatment equipment, manufacturing tools, etc., can solve the problems of high instantaneous heating energy consumption, high production cost, low production efficiency, etc., to reduce heat treatment costs, stabilize numerical fluctuations, improve The effect of production efficiency
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Embodiment 1
[0055] 1. Steel ingot smelting process
[0056] The chemical composition of the electroslag ingot is shown in Table 3.
[0057] 2. Steel ingot rolling process
[0058] The rolled product size is ф30mm bar.
[0059] 3. Incomplete pre-annealing + quenching + tempering heat treatment for finished bars
[0060] The first step: the finished bar is incompletely annealed in a 9# chamber furnace, the annealing temperature is 760°C, the holding temperature deviation is ±10°C, and the heat preservation is for 16h, and then slowly cooled to 620°C to 628°C at a speed of no more than 50°C / h ℃ out of the oven, air-cooled.
[0061] Step 2: The bar after incomplete pre-annealing is quenched and heat-treated in a continuous furnace, the quenching temperature is 930°C, the holding temperature deviation is ±10°C, and the holding time is 1h40min;
[0062] The third step: the quenching of the bar is cooled by water-air alternate time control method, the surface temperature of the bar is not hi...
Embodiment 2
[0071] 1. Steel ingot smelting process
[0072] The chemical composition of the electroslag ingot is shown in Table 3.
[0073] 2. Steel ingot rolling process
[0074] Rolled product size ф50mm bar.
[0075] 3. Incomplete pre-annealing + quenching + tempering heat treatment for finished bars
[0076] The first step: the finished bar is incompletely annealed in a 7# chamber furnace, the annealing temperature is 760°C, the holding temperature deviation is ±10°C, and the holding temperature is 18h, and then slowly cooled to 630°C at a speed of no more than 60°C / h. air cooled.
[0077] Step 2: The bar after incomplete pre-annealing is quenched and heat-treated in a continuous furnace, the quenching temperature is 930°C, the holding temperature deviation is ±10°C, and the holding time is 2.5h;
[0078] The third step: the quenching of the bar is cooled by water-air alternating time control method, the surface temperature of the bar is not higher than 280 ℃, and air cooling;
...
Embodiment 3
[0087] 1. Steel ingot smelting process
[0088] The chemical composition of the electroslag ingot is shown in Table 3.
[0089] 2. Steel ingot rolling process
[0090] Rolled product size ф75mm bar.
[0091] 3. Incomplete pre-annealing + quenching + tempering heat treatment for finished bars
[0092] The first step: the finished bar is incompletely annealed in a 7# chamber furnace, the annealing temperature is 760°C, the holding temperature deviation is ±10°C, and the holding temperature is 18h, and then slowly cooled to 630°C at a speed of no more than 60°C / h. air cooled.
[0093] Step 2: The bar after incomplete pre-annealing is quenched and heat-treated in a continuous furnace, the quenching temperature is 930°C, the holding temperature deviation is ±10°C, and the holding time is 2.5h;
[0094] The third step: the quenching of the bar is cooled by water-air alternate time control method, the surface temperature of the bar is not higher than 260 ℃, and air cooling;
[0...
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